what does the __GL_DOOM3 environment variable do? also what about these X.Org Options?

Option "VideoKey"

Option "ConstantFrameRateHint"

Option "DumpPB"

Option "InternalDebugLevel"

Option "VersionCheck"

Option "ClearCube"

Option "RegistryBinary"
Option "RegistryDwords" (common heresay tells us that NVIDIA is using shared
driver code between Windows and Linux so this would assume that it's
also using a similar function of the Windows Registry.)

is there any chance we could get documentation for these driver options?

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Telomerase

Telomerase is an enzyme that adds telomere repeat sequences to the 3' end of DNA strands. By lengthening this strand DNA polymerase is able to complete the synthesis of the "incomplete ends" of the opposite strand.
Telomerase:

* is a ribonucleoprotein;
* Its single RNA molecule provides an AAUCCC (in mammals) template to guide the insertion of TTAGGG.
* Its protein component — called TERT ("TElomere Reverse Transcriptase") — provides the catalytic action.
* Thus telomerase is a reverse transcriptase; synthesizing DNA from an RNA template.

I don't really know what all of these options do but most are for internal use. The last two for instance can manipulate the internal driver registry (!) which in the past contained options available in the windows registry. I don't know the syntax of the options but you could experiment with it